Answer:
the domain would be everything but -5 and 5. so all real numbers except for 5 and -5
321.786 = 321.79
240.273 = 240.27
321.79 + 240.27 = 562.06
the answer is c
So, the perfect point for the bulb is at parabolic focus. Thankfully, parabolic equation is given in a standart form. So, the visual representation on the carthesian will be a parabola laying sideways facing to the right, with an extremum of (2; -3). Standart view is
. Then, focal parameter is
. Then, focus will be at (2+0.5p; -3) or (8,5; -3).